SAMOP 2023 – scientific programme

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A: Fachverband Atomphysik

A 12: Poster I

A 12.28: Poster

Tuesday, March 7, 2023, 16:30–19:00, Empore Lichthof

Coherent x-ray double-pulse generation — •Junhee Lee and Jörg Evers — Max-Planck-Institut für Kernphysik, Heidelberg, Germany

A scheme for producing coherent x-ray double-pulses of nanosecond-scale duration and temporal separation is devised, based on the Mössbauer effect of ⁵⁷Fe operating at 14.4 keV. Our work is motivated by the recent demonstration of the coherent control of nuclear dynamics using double-pulses with tunable relative phase [1]. The temporal phase of the x-rays can be employed to shape their pulse spectra [2], similar to pulse-shape control at lower frequencies. Also the splitting of γ-ray photons into double-pulses or trains has been demonstrated [3]. However, further progress in the coherent manipulation of nuclear dynamics requires more versatile pulse control. Here, we propose a new method to control the time-dependent phase and temporal intensity. Our approach is based on the coherent scattering enabled by the Mössbauer effect, with additional phase control realized using mechanical displacements. By using multiple Mössbauer targets, interference between the different scattering channels can be enginered in such a way that the desired intensity modulation is achieved. 0.1cm [1] K. P. Heeg et al., Coherent x-ray-optical control of nuclear excitons, Nature 590, 401 (2021).

[2] K. P. Heeg et al., Spectral narrowing of x-ray pulses for precision spectroscopy with nuclear resonances, Science 357, 375 (2017).

[3] F. Vagizov et al., Coherent control of the waveforms of recoilless γ-ray photons, Nature 508, 80 (2014).